Issue with Updating to latest release of OpenMC

Hi all,
Currently, I am using OpenMC version 0.7.0 in Ubuntu. And I need to update it to OpenMC version 0.7.1. While using the command line “sudo apt-add-repository ppa:paulromano/staging” in terminal the result is :
Cannot add PPA: ‘ppa:paulromano/staging’.
Please check that the PPA name or format is correct.
And also by inserting command line “sudo apt-get install openmc” it says :

Reading package lists… Done
Building dependency tree
Reading state information… Done
E: Unable to locate package openmc
Which thing is missing or where is the mistake?

Regards,
Mirza

Hi Mirza- what version of Ubuntu are you on?

Best regards,
Paul

Hi Paul,
It is ubuntu 14.04 LTS.

Regards,
Mirza